Unfortunately, it’s far more likely that Jon Seda is joking. There are no official plans for him to return to Chicago P.D. and if there were, that’s something that NBC would almost certainly announce and promote in advance. The network clearly knows how many fans the actor and the character of Antonio have, so they’d want to let everyone know Seda was returning.

Furthermore, the actor is currently a series regular on another NBC program: the sci-fi drama La Brea, where he plays Dr. Sam Velez. His son, Jon Seda Jr., also played “Young Sam” in Season 2, Episode 6, “Lazarus.”

Source: https://www.distractify.com/p/is-jon-seda-returning-to-chicago-pd